MessagePack-CSharp: ExpandoObject formatter can perform quadratic insertion work on untrusted maps
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| MessagePack-CSharp | MessagePack-CSharp | affected |
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Configuration 1 [-]
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No data.
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| Messagepack | Messagepack-csharp |
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| Source | ID | Title |
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Github GHSA |
GHSA-2x83-8g95-xh59 | MessagePack-CSharp: ExpandoObject formatter can perform quadratic insertion work on untrusted maps |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.405% probability within 30 days)
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Messagepack
Messagepack messagepack-csharp |
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| Vendors & Products |
Messagepack
Messagepack messagepack-csharp |
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| Metrics |
ssvc
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| Description | MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, ExpandoObjectFormatter.Deserialize populates System.Dynamic.ExpandoObject by calling IDictionary<string, object>.Add for each map entry. ExpandoObject internally maintains member names in array-like structures, so inserting many distinct keys can require repeated linear scans and array copies. For large attacker-controlled maps, this produces quadratic CPU and allocation behavior. The issue is especially surprising because ExpandoObjectResolver.Options is configured with MessagePackSecurity.UntrustedData, but collision-resistant dictionary comparers cannot protect ExpandoObject insertion internals. This vulnerability is fixed in 2.5.301 and 3.1.7. | |
| Title | MessagePack-CSharp: ExpandoObject formatter can perform quadratic insertion work on untrusted maps | |
| Weaknesses | CWE-407 | |
| References |
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| Metrics |
cvssV4_0
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